Abstract
By the advent of the fast DSP, now, it is possible to change whole over 100MHz bandwidth to frequency samples. This paper propose methods of PSK demodulation and CDMA despreading both starting from frequency samples. PSK signal frequency samples are selected from the whole frequency samples which covers total beam bandwidth. After selecting frequency samples, samples are decimated to appropriate lower rate. Then, frequency samples are transformed to time samples by IFFT. Time samples are squared and transformed again to frequency samples. The first and the second peaks are used to recover carrier information. In case of CDMA, frequency domain correlation method is applied. The code for despreading is transformed to frequency samples by FFT. Then fast correlation method is applied to despreading or despreading synchronization.
| Original language | English |
|---|---|
| Title of host publication | 21st International Communications Satellite Systems Conference and Exhibit |
| Publication status | Published - 2003 |
| Externally published | Yes |
| Event | 21st International Communications Satellite Systems Conference and Exhibit, ICSSC 2003 - Yokohama, Japan Duration: 2003 Apr 15 → 2003 Apr 19 |
Other
| Other | 21st International Communications Satellite Systems Conference and Exhibit, ICSSC 2003 |
|---|---|
| Country | Japan |
| City | Yokohama |
| Period | 03/4/15 → 03/4/19 |
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ASJC Scopus subject areas
- Computer Networks and Communications
- Signal Processing
- Atmospheric Science
- Electrical and Electronic Engineering
- Media Technology
Cite this
Demodulation and despreading from frequency samples. / Egami, Shunichiro; Sugiyama, Katsumi.
21st International Communications Satellite Systems Conference and Exhibit. 2003.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Demodulation and despreading from frequency samples
AU - Egami, Shunichiro
AU - Sugiyama, Katsumi
PY - 2003
Y1 - 2003
N2 - By the advent of the fast DSP, now, it is possible to change whole over 100MHz bandwidth to frequency samples. This paper propose methods of PSK demodulation and CDMA despreading both starting from frequency samples. PSK signal frequency samples are selected from the whole frequency samples which covers total beam bandwidth. After selecting frequency samples, samples are decimated to appropriate lower rate. Then, frequency samples are transformed to time samples by IFFT. Time samples are squared and transformed again to frequency samples. The first and the second peaks are used to recover carrier information. In case of CDMA, frequency domain correlation method is applied. The code for despreading is transformed to frequency samples by FFT. Then fast correlation method is applied to despreading or despreading synchronization.
AB - By the advent of the fast DSP, now, it is possible to change whole over 100MHz bandwidth to frequency samples. This paper propose methods of PSK demodulation and CDMA despreading both starting from frequency samples. PSK signal frequency samples are selected from the whole frequency samples which covers total beam bandwidth. After selecting frequency samples, samples are decimated to appropriate lower rate. Then, frequency samples are transformed to time samples by IFFT. Time samples are squared and transformed again to frequency samples. The first and the second peaks are used to recover carrier information. In case of CDMA, frequency domain correlation method is applied. The code for despreading is transformed to frequency samples by FFT. Then fast correlation method is applied to despreading or despreading synchronization.
UR - http://www.scopus.com/inward/record.url?scp=84897699323&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84897699323&partnerID=8YFLogxK
M3 - Conference contribution
SN - 9781624100932
BT - 21st International Communications Satellite Systems Conference and Exhibit
ER -